Monarch Butterflies in Idaho in September
Yes, September is one of the best months to see monarch butterflies in Idaho. It is the 2nd busiest month of the year, with 105 of the 481 sightings logged across the year (21.8%), based on verified iNaturalist records.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Peak month for monarch butterflies in Idaho
21.8%
of yearly sightings
105
records in September
#2
busiest month of 12
481
verified records a year
August 35.8%, September 21.8%, October 4%. Busiest month is August at 35.8%.
481 verified observations of monarch butterflies in Idaho, recorded across 6 months of the year on iNaturalist.
When monarch butterflies are recorded in Idaho
Peak month
August
172 records (35.8% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 5 | 1% |
| June | 76 | 15.8% |
| Julypeak | 104 | 21.6% |
| Augustpeak | 172 | 35.8% |
| Septemberpeak | 105 | 21.8% |
| October | 19 | 4% |
| November | 0 | 0% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 481 |
In Idaho, September carries 21.8% of the year's monarch butterflies sightings, about 13.5 points above an even month-to-month split. That makes it the 2nd busiest of the twelve months, out of 6 months with recorded activity.
Activity is easing off from August (35.8%) into September, and it heads toward October (4%) after. This is right inside the peak window, so September is one of the surest months to plan a trip around.
The monarch butterflies most often recorded in Idaho are Monarch. Those counts are annual totals rather than a September split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in September itself.
Which monarch butterflies you are most likely to see
- Monarch481 records
Plan your monarch butterfly trip in Idaho
Start with live tours near City Of Rocks National Reserve, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near City Of Rocks National Reserve
Use the live GetYourGuide widget to compare local departures and activity styles close to the main monarch butterfly viewing area.
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Stay nearbyStay near City Of Rocks National Reserve
Compare hotels, cabins and lodges close to the best monarch butterfly viewing area in Idaho.
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Broader backupBook a monarch butterfly tour in Idaho
Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Frequently asked questions
Can you see monarch butterflies in Idaho in September?+
Yes. September accounts for 105 of the 481 verified monarch butterflies sightings logged in Idaho across the year, which is 21.8% of the annual total.
Is September a good time to see monarch butterflies in Idaho?+
September is one of the best months. It ranks 2nd of the year and sits inside the peak window of August, September and July.
What month is best for monarch butterflies in Idaho?+
August is the single busiest month, with the broader peak running through August, September and July, based on 481 verified observations.
Which monarch butterflies are you most likely to see in Idaho?+
The most-recorded species in Idaho are Monarch, based on all-time iNaturalist counts.
See monarch butterflies in Idaho in other months
More wildlife in Idaho